Started today with rot.js and got to a good start:
http://gfycat.com/BriskCanineAmericanwarmbloodI'm aiming to make this playable on smartphones too, hence the "touch where you want the @ to move"-controls. On desktop, keyboard is also available.
Currently I have movement, picking up items and simple world generation with separate maps for player's base and overworld planet surface:
http://youtu.be/7bvGfovWyFw